The _______ function in Go is used to make a copy of a slice or map.
- clone
- copy
- duplicate
- replicate
The copy function in Go is used to make a copy of a slice or map. It takes two arguments: the destination slice or map and the source slice or map to copy from. It creates a new copy, independent of the original.
What are the advantages of using pointers in Go?
- Ability to modify values passed to functions
- Automatic garbage collection
- Improved performance due to reduced memory usage
- Simplicity in code structure
Pointers in Go offer advantages such as the ability to modify values passed to functions, which is especially useful for large data structures, leading to improved performance. Additionally, they enable the sharing of data between different parts of a program efficiently.
The _______ keyword in Go is used to check if a key exists in a map.
- _, exists := myMap[key]
- _, exists = myMap[key]
- exists := myMap[key]
- exists = myMap[key]
The _ is a blank identifier used to discard values in Go. When used in conjunction with map lookup, it discards the value but captures whether the key exists or not in the map.
What is used in Go to communicate between goroutines?
- Channels
- Mutexes
- Pointers
- Slices
Channels are the preferred way to communicate between goroutines in Go, providing a safe and efficient means of passing data.
In Go, can anonymous functions be recursive?
- Go does not support anonymous functions
- It depends on the context
- No
- Yes
Yes, anonymous functions in Go can indeed be recursive. This means they can call themselves within their own definition. This feature can be useful in scenarios where a function needs to call itself until a certain condition is met, similar to traditional recursive functions.
In MongoDB, collections are the equivalent of _______ in relational databases.
- Columns
- Documents
- Rows
- Tables
Collections in MongoDB are analogous to Tables in relational databases. They are containers for documents, where each document can vary in structure but is typically JSON-like.
You're reviewing the code coverage report and notice that certain critical functions are not adequately covered. How would you address this issue?
- Analyze the code to understand why these critical functions are not adequately covered and prioritize writing additional tests to cover them.
- Implement code coverage thresholds and include them in the project's CI/CD pipeline to enforce minimum coverage requirements.
- Refactor the code to simplify complex functions and reduce dependencies, making them easier to test.
- Use code coverage tools to identify code paths that are not exercised during testing and create test cases to cover those paths.
Analyzing the reasons behind inadequate test coverage can help in identifying specific areas that need attention. Utilizing code coverage tools and refactoring can improve the overall testability of the codebase, while implementing coverage thresholds ensures that new code contributions meet minimum testing standards.
What is a type assertion in Go interfaces?
- Asserting the type of a variable
- Checking the type of a variable
- Converting a variable to another type
- Declaring a new data type
In Go, a type assertion is used to determine the actual type of an interface variable at runtime. It checks whether the dynamic type of an interface variable is identical to the asserted type.
In Go, which loop is used to iterate over elements in an array, slice, string, or map?
- for loop
- foreach loop
- range loop
- while loop
The range loop in Go is used to iterate over elements in an array, slice, string, or map. It provides a concise syntax for iterating over collections and is commonly used in Go for such purposes.
How can you improve performance when working with JSON in Go applications?
- Leveraging concurrency for JSON operations
- Minimizing allocations during JSON encoding and decoding
- Precomputing JSON encoding for frequently used data
- Using a faster JSON encoding library
Improving performance when working with JSON in Go applications involves various strategies to minimize overhead and optimize resource usage. One approach is to minimize allocations during JSON encoding and decoding by reusing buffers and pools where possible. This helps reduce memory churn and improves efficiency, especially in high-throughput scenarios. Additionally, precomputing JSON encoding for frequently used data can save processing time by caching serialized representations. While using a faster JSON encoding library may offer some performance gains, the built-in encoding/json package in Go is generally efficient for most use cases. Finally, leveraging concurrency for parallel JSON operations can further enhance performance by utilizing multiple CPU cores effectively. By applying these techniques judiciously, developers can achieve better performance when working with JSON in Go applications.